.btn_primary {
  background: yellow;
  border: 1px solid #cccc00;
}

.btn_default {
  background: skyblue;
  border: 1px solid #5bbce4;
}

.btn_warn {
  background: red;
  border: 1px solid #cc0000;
}

.btn_success {
  background: green;
  border: 1px solid #004d00;
}
